Protection Tube Which Is Resistant To High Temperatures

ABSTRACT

The invention relates to a protection tube which is resistant to high temperatures and which comprises a plurality of threads ( 1 ) which are braided, knit-braided or knitted to one another. Said threads ( 1 ) contain one or more metallic wires ( 3 ) therein.

The invention relates to a protection tube which is resistant to hightemperatures, for example for the mechanical and thermal protection ofautomobile exhaust pipes.

BACKGROUND TO THE INVENTION

At the present time protection tubes are used to product electricalconductors and other components, especially in the automobile industry.

These protection tubes must combine different characteristics that makethem suitable for these types of uses.

In the first place, the protection tubes must have great mechanical andthermal resistance, as they are used in areas of high temperature andwhere they are subjected to abrasion.

In addition, these protection tubes must include noise insulationcharacteristics, as it would be unacceptable for these protection tubesto produce noise when used in automobiles.

In order to solve these disadvantages there are a great number ofprotection tubes that combine these characteristics and which arecurrently used to protect cables in automobiles.

One of the most important characteristics that these protection tubesmust have is resistance to high temperatures.

At the present time there are protection tubes formed from a pluralityof glass fibre threads which are braided, knit-braided and knitted toone another and coated with a silicone emulsion. These protection tubesare used to achieve good thermal insulation.

These types of protection tubes fulfil their aims but cannot supportvibrations at very high temperatures, for example those in excess of700° C. for glass fibre and 1,200° C. for silica fibres. This is due tothe fact that the fibres lose their mechanical properties at these hightemperatures, which prevents these protection tubes from being used forautomobile exhausts, for example.

DESCRIPTION OF THE INVENTION

With the protection tube of the invention the stated disadvantages areresolved, presenting other advantages which will be described.

The protection tube of this present invention comprises a plurality ofthreads which are braided, knit-braided or knitted to one another, andcharacterised because said threads contain one or more metallic wirestherein.

In accordance with a preferred embodiment, said metallic wires are madefrom stainless steel.

By preference, said threads are made from glass or silica fibre and canbe covered with a silicone emulsion.

With the protection tube of this present invention great thermal andmechanical resistance is achieved, even at very high temperatures above700° C. and 1,200° C., as the metallic wires provided more mechanicalresistance.

A BRIEF DESCRIPTION OF THE DRAWINGS

In order to give a greater understanding of that which has been statedsome drawings are included in which an outline of a practical embodimentis made which is made by way of being an example and without being byway of limitation.

FIG. 1 shows an outline view of a transverse section of the protectionof the present invention; and

FIG. 2 shows a detail of a cross-section of one of said threads.

DESCRIPTION OF PREFERRED EMBODIMENT

As and how it can be seen in the figures, the protection tube of thepresent invention comprises a plurality of threads (1) which arebraided, knit-braided or knitted to one another. Said threads (1) aremade from glass or silica fibre and are covered with a silicone emulsion(2).

In accordance with the invention, each one of these threads contains oneor more metallic wires (3) therein, which are by preference made fromstainless steel.

As has been stated previously, thanks to the presence of the metallicwire on the inside of the threads it is possible to use the protectiontube of this present invention in places subjected to very hightemperatures, even in excess of 700° C. and 1,200° C. depending on thematerial, for example for automobile exhausts.

In spite of the fact that reference has been made to a specificembodiment of the invention, it is clear for an expert in the subjectmatter that the protection tube described is capable of being used withnumerous variations and modifications, and all of the details mentionedcan be substituted for others that are technically equivalent, withoutdeparting from the scope of the protection defined by the attachedclaims.

1. Protection tube which is resistant to high temperatures, thatcomprises a plurality of threads (1) which are braided, knit-braided orknitted to one another, characterised in that said threads (1) containone or more metallic wires (3) therein.
 2. Protection tube according toclaim 1, characterised in that said metallic wires (3) are made fromstainless steel.
 3. Protection tube according to claim 1, characterisedin that said threads (1) are made from glass or silica fibre. 4.Protection tube according to claim 1, characterised in that said threads(1) are covered with a silicone emulsion (2).
 5. Protection tubeaccording to claim 3, characterised in that said threads (1) are coveredwith a silicone emulsion (2).